21 
semi-opal , agreeing in its principal characters with 
the common ; specimens of those varieties which, 
having the property of becoming transparent when 
immersed in water, are called hydrophanes, and vul¬ 
garly oculus mundi; wood-opal , or opalized wood ; 
jasp-opal , referred by some authors to jasper ; the 
menilite, called also liver-opal, found at Menil- 
Montant, near Paris, in a bed of adhesive slate, a 
specimen of which is added. Some varieties of ca- 
cholong may likewise be referred to the opal-tribe. 
—The remainder of this case is occupied by the si¬ 
liceous substance called horn stone, divided into the 
conchoidal and splintery varieties; among these 
are the remarkable pseudomorphous crystals from 
Schneeberg in Saxony, derived from various modi¬ 
fications of calcareous spar, and generally referred 
to conchoidal hornstone ; also some beautiful spe¬ 
cimens of wood converted into hornstone, being 
the wood-stone of Werner; hornstone balls, from 
Haunstadt in Bavaria.— -Flinty slate, &c. 
(Case 9.) In this case are deposited (besides the 
specimens of rock crystals continued from the op¬ 
posite compartment of the table case) the different; 
varieties or subspecies of jasper, such as they are 
enumerated by Werner, viz. the globular or Egyp¬ 
tian jasper, found chiefly near Cairo, in rounded 
pieces, which appear not to owe their form to roll¬ 
ing, but to be original and produced by infiltration; 
the ribbon jasper , or striped jasper, the finest vari¬ 
eties 
SALOON. 
Nat. Hist. 
